MEDIUMCVSS v4 4.8Vulnerability
CVE-2026-16889
In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.
Properties
- Severity
- MEDIUM
- Nvd fetched at
- 2026-10-29T03:46:53.555909+00:00
- Cvss severity
- MEDIUM
- Cvss score
- 4.8
- Retrieved at
- 2026-10-29T03:47:35+00:00
- Score
- 4.8
- Cvss version
- 4.0
- Last source
- NVD
- Cve id
- CVE-2026-16889
- Cvss vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- First seen by Signal
- 2026-10-29T03:47:35+00:00
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published at
- 2026-10-29T02:16:51.803
- Last modified
- 2026-10-29T02:16:51.803
Related Entities (1)
HAS_WEAKNESS (1)
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